[PATCH] D101212: [AST][JSON] Fix null ptr crash dumping TemplateTemplateParmDecl

[David Tolnay via Phabricator via cfe-commits]

dtolnay created this revision.
dtolnay added a reviewer: aaron.ballman.
Herald added a subscriber: kristof.beyls.
dtolnay requested review of this revision.
Herald added a project: clang.

Minimal repro-- the following program winds up with
D->getDefaultArgStorage().getInheritedFrom() == nullptr during dumping the
TemplateTemplateParmDecl corresponding to the template parameter of i.

  template <typename>
  struct R;
  template <template <typename> class = R>
  void i();

Previously--

   #6 clang::TemplateTemplateParmDecl::getSourceRange() const clang/include/clang/AST/DeclTemplate.h:1745
  #15 clang::JSONNodeDumper::VisitTemplateTemplateParmDecl(clang::TemplateTemplateParmDecl const*) clang/lib/AST/JSONNodeDumper.cpp:889
  #16 clang::JSONNodeDumper::Visit(clang::Decl const*) clang/lib/AST/JSONNodeDumper.cpp:128
  ...
  clang-13: error: unable to execute command: Segmentation fault (core dumped)


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D101212

Files:
  clang/lib/AST/JSONNodeDumper.cpp
  clang/test/AST/ast-dump-template-decls-json.cpp

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